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From: Elijah Newren <newren@gmail.com>
To: Derrick Stolee <stolee@gmail.com>
Cc: Git Mailing List <git@vger.kernel.org>
Subject: Re: [PATCH v2 06/20] merge-ort: implement a very basic collect_merge_info()
Date: Wed, 11 Nov 2020 09:02:27 -0800	[thread overview]
Message-ID: <CABPp-BFGs-uMNT3Ge6ZttMTxNEu-S3cdwU74XjNYYent3PQi6g@mail.gmail.com> (raw)
In-Reply-To: <42037753-c8c1-629c-3d99-d54842686b2e@gmail.com>

On Wed, Nov 11, 2020 at 6:38 AM Derrick Stolee <stolee@gmail.com> wrote:
>
> On 11/2/2020 3:43 PM, Elijah Newren wrote:
> > +     /* +1 in both of the following lines to include the NUL byte */
> > +     fullpath = xmalloc(len+1);
> > +     make_traverse_path(fullpath, len+1, info, p->path, p->pathlen);
>
> nit: s/len+1/len + 1/g
>
> > +             void *buf[3] = {NULL,};
>
> This "{NULL,}" seems odd to me. I suppose there is a reason why it
> isn't "{ NULL, NULL, NULL }"?

Probably because I was copying from unpack-trees.c, which deals with a
variable number of trees instead of always exactly 3.  But yeah, it'd
probably be more straightforward as { NULL, NULL, NULL }.

> > +             const char *original_dir_name;
> > +             int i, ret;
> > +
> > +             ci->match_mask &= filemask;
> > +             newinfo = *info;
> > +             newinfo.prev = info;
> > +             newinfo.name = p->path;
> > +             newinfo.namelen = p->pathlen;
> > +             newinfo.pathlen = st_add3(newinfo.pathlen, p->pathlen, 1);
> > +
> > +             for (i = 0; i < 3; i++, dirmask >>= 1) {
>
> This multi-action iterator borders on "too clever". It seems like
> placing "dirmask >>= 1;" or "dirmask = dirmask >> 1;" at the end
> of the block would be equivalent and less jarring to a reader.
>
> I was thinking it doesn't really matter, except that dirmask is not
> in the initializer or sentinel of the for(), so having it here does
> not immediately make sense.
>
> (This has been too much writing for such an inconsequential line
> of code. Sorry.)

Yeah, copied from unpack-trees.c:traverse_trees_recursive().  The
newinfo variable name and a bunch of the surrounding lines were copied
from there too.  I can switch it, though, if it makes it easier.

> > +                     const struct object_id *oid = NULL;
> > +                     if (dirmask & 1)
> > +                             oid = &names[i].oid;
> > +                     buf[i] = fill_tree_descriptor(opt->repo, t + i, oid);
> > +             }
>
>
> >  static int collect_merge_info(struct merge_options *opt,
> >                             struct tree *merge_base,
> >                             struct tree *side1,
> >                             struct tree *side2)
> >  {
> > -     /* TODO: Implement this using traverse_trees() */
> > -     die("Not yet implemented.");
> > +     int ret;
> > +     struct tree_desc t[3];
> > +     struct traverse_info info;
> > +     char *toplevel_dir_placeholder = "";
>
> It seems like this should be "const char *"
>
> > +     init_tree_desc(t+0, merge_base->buffer, merge_base->size);
> > +     init_tree_desc(t+1, side1->buffer, side1->size);
> > +     init_tree_desc(t+2, side2->buffer, side2->size);
>
> More space issues: s/t+/t + /g

In my defense:

$ git grep init_tree_desc.*t.*\+ | grep -v merge-ort
builtin/merge.c: init_tree_desc(t+i, trees[i]->buffer, trees[i]->size);
builtin/read-tree.c: init_tree_desc(t+i, tree->buffer, tree->size);
merge-recursive.c: init_tree_desc_from_tree(t+0, common);
merge-recursive.c: init_tree_desc_from_tree(t+1, head);
merge-recursive.c: init_tree_desc_from_tree(t+2, merge);
merge.c: init_tree_desc(t+i, trees[i]->buffer, trees[i]->size);

None of which blames to me.  :-)

I can fix it up, though...at least the merge-ort one.  Someone else
can go through existing code if they so desire.

> I'm only really able to engage in this at a surface level, it
> seems, but maybe I'll have more to say as the implementation
> grows.

It _might_ be helpful to compare to unpack-trees.c's unpack_callback()
and traverse_trees_recursive(), but there's so much unrelated stuff
there that it's possible that just gets in the way more than it helps.
Regardless, thanks for taking a look and spotting little fixes; every
bit helps.

  reply	other threads:[~2020-11-11 17:02 UTC|newest]

Thread overview: 84+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-02 20:43 [PATCH v2 00/20] fundamentals of merge-ort implementation Elijah Newren
2020-11-02 20:43 ` [PATCH v2 01/20] merge-ort: setup basic internal data structures Elijah Newren
2020-11-06 22:05   ` Jonathan Tan
2020-11-06 22:45     ` Elijah Newren
2020-11-09 20:55       ` Jonathan Tan
2020-11-02 20:43 ` [PATCH v2 02/20] merge-ort: add some high-level algorithm structure Elijah Newren
2020-11-02 20:43 ` [PATCH v2 03/20] merge-ort: port merge_start() from merge-recursive Elijah Newren
2020-11-11 13:52   ` Derrick Stolee
2020-11-11 16:22     ` Elijah Newren
2020-11-02 20:43 ` [PATCH v2 04/20] merge-ort: use histogram diff Elijah Newren
2020-11-11 13:54   ` Derrick Stolee
2020-11-11 16:47     ` Elijah Newren
2020-11-11 16:51       ` Derrick Stolee
2020-11-11 17:03         ` Elijah Newren
2020-11-02 20:43 ` [PATCH v2 05/20] merge-ort: add an err() function similar to one from merge-recursive Elijah Newren
2020-11-11 13:58   ` Derrick Stolee
2020-11-11 17:07     ` Elijah Newren
2020-11-11 17:10       ` Derrick Stolee
2020-11-02 20:43 ` [PATCH v2 06/20] merge-ort: implement a very basic collect_merge_info() Elijah Newren
2020-11-06 22:19   ` Jonathan Tan
2020-11-06 23:10     ` Elijah Newren
2020-11-09 20:59       ` Jonathan Tan
2020-11-11 14:38   ` Derrick Stolee
2020-11-11 17:02     ` Elijah Newren [this message]
2020-11-02 20:43 ` [PATCH v2 07/20] merge-ort: avoid repeating fill_tree_descriptor() on the same tree Elijah Newren
2020-11-11 14:51   ` Derrick Stolee
2020-11-11 17:13     ` Elijah Newren
2020-11-11 17:21       ` Eric Sunshine
2020-11-02 20:43 ` [PATCH v2 08/20] merge-ort: compute a few more useful fields for collect_merge_info Elijah Newren
2020-11-06 22:52   ` Jonathan Tan
2020-11-06 23:41     ` Elijah Newren
2020-11-09 22:04       ` Jonathan Tan
2020-11-09 23:05         ` Elijah Newren
2020-11-02 20:43 ` [PATCH v2 09/20] merge-ort: record stage and auxiliary info for every path Elijah Newren
2020-11-06 22:58   ` Jonathan Tan
2020-11-07  0:26     ` Elijah Newren
2020-11-09 22:09       ` Jonathan Tan
2020-11-09 23:08         ` Elijah Newren
2020-11-11 15:26   ` Derrick Stolee
2020-11-11 18:16     ` Elijah Newren
2020-11-11 22:06       ` Elijah Newren
2020-11-12 18:23         ` Derrick Stolee
2020-11-12 18:39       ` Derrick Stolee
2020-11-02 20:43 ` [PATCH v2 10/20] merge-ort: avoid recursing into identical trees Elijah Newren
2020-11-11 15:31   ` Derrick Stolee
2020-11-02 20:43 ` [PATCH v2 11/20] merge-ort: add a preliminary simple process_entries() implementation Elijah Newren
2020-11-11 19:51   ` Jonathan Tan
2020-11-12  1:48     ` Elijah Newren
2020-11-02 20:43 ` [PATCH v2 12/20] merge-ort: have process_entries operate in a defined order Elijah Newren
2020-11-11 16:09   ` Derrick Stolee
2020-11-11 18:58     ` Elijah Newren
2020-11-02 20:43 ` [PATCH v2 13/20] merge-ort: step 1 of tree writing -- record basenames, modes, and oids Elijah Newren
2020-11-11 20:01   ` Jonathan Tan
2020-11-11 20:24     ` Elijah Newren
2020-11-12 20:39       ` Jonathan Tan
2020-11-02 20:43 ` [PATCH v2 14/20] merge-ort: step 2 of tree writing -- function to create tree object Elijah Newren
2020-11-11 20:47   ` Jonathan Tan
2020-11-11 21:21     ` Elijah Newren
2020-11-02 20:43 ` [PATCH v2 15/20] merge-ort: step 3 of tree writing -- handling subdirectories as we go Elijah Newren
2020-11-12 20:15   ` Jonathan Tan
2020-11-12 22:30     ` Elijah Newren
2020-11-24 20:19       ` Elijah Newren
2020-11-25  2:07         ` Jonathan Tan
2020-11-26 18:13           ` Elijah Newren
2020-11-30 18:41             ` Jonathan Tan
2020-11-02 20:43 ` [PATCH v2 16/20] merge-ort: basic outline for merge_switch_to_result() Elijah Newren
2020-11-02 20:43 ` [PATCH v2 17/20] merge-ort: add implementation of checkout() Elijah Newren
2020-11-02 20:43 ` [PATCH v2 18/20] tree: enable cmp_cache_name_compare() to be used elsewhere Elijah Newren
2020-11-02 20:43 ` [PATCH v2 19/20] merge-ort: add implementation of record_unmerged_index_entries() Elijah Newren
2020-11-02 20:43 ` [PATCH v2 20/20] merge-ort: free data structures in merge_finalize() Elijah Newren
2020-11-03 14:49 ` [PATCH v2 00/20] fundamentals of merge-ort implementation Derrick Stolee
2020-11-03 16:36   ` Elijah Newren
2020-11-07  6:06     ` Elijah Newren
2020-11-07 15:02       ` Derrick Stolee
2020-11-07 19:39         ` Elijah Newren
2020-11-09 12:30           ` Derrick Stolee
2020-11-09 17:13             ` Elijah Newren
2020-11-09 19:51               ` Derrick Stolee
2020-11-09 22:44                 ` Elijah Newren
2020-11-11 17:08 ` Derrick Stolee
2020-11-11 18:35   ` Elijah Newren
2020-11-11 20:48     ` Derrick Stolee
2020-11-11 21:18       ` Elijah Newren
2020-11-29  7:43 [PATCH " Elijah Newren via GitGitGadget
2020-12-04 20:47 ` [PATCH v2 " Elijah Newren via GitGitGadget
2020-12-04 20:47   ` [PATCH v2 06/20] merge-ort: implement a very basic collect_merge_info() Elijah Newren via GitGitGadget

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